Semantic embellishments rely on relationships of meaning: opposition for ṭibāq, compatibility for murāʿāt al-naẓīr, near and remote senses for tawriyah, and the appropriate distinctions for exaggeration and imaginative causation.
Verbal embellishments depend on form: word resemblance with distinct senses for jinās, corresponding prose endings for sajʿ, and a particular opening–ending relation for returning the ending to the beginning.
The value of a device rests on its contribution to meaning. Rhyme, repetition or unfamiliar vocabulary alone is insufficient evidence.